ASP.NET PDF Viewer using C#, VB/NET

In this case, you should place the key file in the solution directory and set the Key File property of all your projects to $(SolutionDir)keyfilesnk You should sign all your assemblies apart from simple test applications and libraries like the ones shown so far Signing assemblies gives you the following benefits: If and only if an assembly has a unique name, all types defined in the assembly have a unique name, too Assemblies without a strong name cannot be referenced by strongly named assemblies As an example, if you try to link DumpAssemblyInfoexe with the command-line option /KEYFILE, and the dependent assembly SampleLibdll is not signed, you will get a linker error complaining that the referenced assembly SampleLib does not have a strong name Assemblies with a weak name can only be installed in the directory where the referencing application is stored or in special subdirectories.

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The items in the crontab line can have the following values: minute: Any integer from 0 to 59 hour: Any integer from 0 to 23 day: Any integer from 1 to 31 (this must be a valid date if a month is specified) month: Any integer from 1 to 12 (or the short name of the month, such as jan or feb) day of week: Any integer from 0 to 7, where 0 and 7 represent Sunday, 1 is Saturday, and so on command: The command you want to execute (this is usually a shell script) Here s a simple example of a crontab line: #---------------------------------------------------------------------minute hour date month day of week command 30 18 * * 1-6 analyze.ksh #----------------------------------------------------------------------The preceding code indicates that the program analyze.ksh will be run Monday through Saturday at 6:30 PM. Once you edit the crontab and input the lines you need to run your commands, you can exit out of cron by pressing Shift+wq, just as you would in a regular vi file. You now have cronned your job, and it will run without any manual intervention at the scheduled time. It s common practice for DBAs to put most of their monitoring and daily data-load jobs in the crontab for automatic execution. If crontab comes back with an error when you first try to edit it, you need to talk to your UNIX system administrator and have appropriate permissions granted.

Note You ll use crontab for all your regularly scheduled database or operating system jobs, but if you want to schedule a task for a single execution, you can use the at or batch command instead. Look up the man pages for more information on these two scheduling commands.

The DBA_THRESHOLDS view provides the current threshold settings for all alerts. This view is useful when you want to find out the current threshold settings for any alert: SQL> SELECT metrics_name, warning_value, critical_value, consecutive_occurrences FROM DBA_THRESHOLDS WHERE metrics_name LIKE '%CPU Time%';

If the .xdisp file for this user exists, the script imports her X display and authority information into the current shell environment. If not, it echoes an error message and exits.

If you get a snapshot too old alert, you may need to increase the size of your undo tablespace. In addition, Tip you may consider increasing the length of the undo retention period. Note that you ll get a maximum of only one undo alert during any 24-hour period.

The Automatic Workload Repository (AWR)

The dynamic performance views V$SYSSTAT and V$SESSSTAT hold many of the important cumulative statistics for the Oracle database Dynamic performance views are very useful in judging database performance, but unfortunately, when you shut down the database, the data in the dynamic performance views disappears completely! If you wish to track database performance over time, or if you wish to compare the performance effects of database changes, you need to store the performance data in a repository, which is where the Automatic Workload Repository (AWR) comes in The AWR is the brand-new feature in Oracle Database 10g that automatically collects and stores database performance statistics relating to problem detection and tuning, and it lies at the heart of the new database self-tuning mechanisms.

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